[issue39664] Improve test coverage for operator module

[Karthikeyan Singaravelan]

New submission from Karthikeyan Singaravelan <tir.karthi at gmail.com>:

This ticket adds tests for operator module where some of the parts where not tested. Current coverage stands at 96.23% [0]. The added tests will get it closer to 100% and will help in testing the Python implementation of operator module.

[0] https://codecov.io/gh/python/cpython/branch/master/history/Lib/operator.py

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components: Tests
messages: 362150
nosy: xtreak
priority: normal
severity: normal
status: open
title: Improve test coverage for operator module
type: behavior
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39664>
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